Stay-bolt structure.



E. I. DOUDS.

STAY BOLT STRUCTURE.

N FILED NIAY3.1918

1,295,871, Patented Mar.4,1919.

v Q I MgdJINVENTOR W] NESSES as hereinafter described and ETEANLDODDS,

UNITED STATES PATENT o FinoEE.

or rrrrsntmen, PENNSYLVANIA, ASSIGNOR. T0 FLANNERY BOLT COMPANY, orrxrrsnnnen, PENNSYLVANIA.

. STAY-BOLT STRUCTURE.

To all whom Money concern Be it known that I, ETHAN I. Donne, .a citizen of the United States, and a resident of Pittsburgh, in the county of Allegheny This invention relates to improvements in staybolt mountings for boilers,-the ob]ect of the invention being to provide simple and efficient means whereby the cap or closure for that type of mounting in which the head of the staybolt has its bearing in a part rigid with the boiler sheet, may be quickly removed to permit access to the head of the staybolt for testing purposes."

invention consists in certain novel features of construction and combinations of parts pointed out in the claims.- 3

In the accompanying drawings, Figure l is a sectional view showing an embodiment of my invention, Fig. 2 is a transverse section, and Fig. 3 is a view of a modification.

1 represents a boiler sheet having an open-.

ing 2 and the metal around this opening is forced or pressed outwardly so as to form an integral boss 3 having its inner face curved as at 4 to form a bearing for the rounded or spherical head 5 of a staybolt 6. This boss is provided at or near its outer end with external segmental shoulders 7 and the end of the boss afiords aseat 8 for the edge portion of a partly spherical cap 9,-

the internal configuration of the latter being such as to afford suitable clearance 10 for the head of the bolt.

The cap 9 is provided with a-peripheral flange 11 which encircles the, shouldered outer end of the boss 3 and said flange is provided at its inner edge with inwardly projecting segmental shoulders 12 to engage Specification of Letters Patent.

Application filed May 3, 1918. Serial No. 232,316.

Patented Mar. 4,1919.

behind the segmental shoulders 7 on the boss and secure the cap firmly to the latter. By turning thecap 9 (with the use of a suitable wrench) until the shoulders 12 shall have moved out of alinement with the shoulders 7 of the boss, said cap may be at once removed from the boss to expose the head of the staybolt for testing purposes.

In the form of the invention shown in Fig. 3 the integral boss 13 is provided interiorly with se mental shoulders 14 and the cap 15 (whic may be formed with an angular exterior portion to receive a wrench) enters said boss and is provided with external segmental shoulders 16 to engage behind the segmental shoulders 14 of the boss.

Having fully described my invention what I claim as new and desire to secure by Lettors-Patent, is: -With this and other ob ects in wow, the

1. The combination of a boiler sheet hav ing an integral boss affording a bearing for the head of a staybolt andprovided near its 'free end with segmental shoulders, and a; cap for removably closin the outerend of said ,boss and provide with segmental shoulders to engage the segmental shoulders of the boss.

2. The combination of a boiler sheet having an integral boss aflording a bearing for the head of a staybolt and provided externally with segmental shoulders, and a cap having a bearing on said boss and closing the outer end of the latter, said cap havin a peripheral flange encircling the shouldered portion of. the boss and provided with inwardly projecting segmental shoulders to engage behind the segmental shoulders of the boss. I v In testimonywhereof, I have signed this specification in the presence of two subscribing witnesses.

' .ETHAN IQDODDS.

Witnesses: S. G. NOTTINGHAM, R. S. FnReUsoN. 

